Patents by Inventor Douglas G. Stinson

Douglas G. Stinson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Magnetooptical recording element
    Patent number: 4877690
    Abstract: A magnetic optical recording element including a rare earth-transition metal recording layer, a barrier layer and a self-passivating active metal layer.
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: October 31, 1989
    Assignee: Eastman Kodak Company
    Inventors: David A. Glocker, Tukaram K. Hatwar, Gregory Lynn McIntire, Srinivas T. Rao, Douglas G. Stinson
  • Magneto-optic read-out method and apparatus with polarization correction means
    Patent number: 4774615
    Abstract: Disclosed herein are an improved method and apparatus for optically reading pre-recorded magnetic information on a magneto-optic recording element. The invention addresses the technical problem of minimizing the adverse effect of unpredictable variations in the state of polarization of the beam of radiation used for read-out. Such variations may be produced, for example, by birefringence variations in a transparent layer or substrate through which the recorded information is recovered. According to the invention, the undesired polarization variations are sensed from the system's output signal, and an error signal representative of such variations is produced. Such error signal is used to adjust the state of polarization of the read-out beam prior to detection by the system's detector elements. Preferably, the read beam is directed through the combination of a quarterwave plate and a Faraday rotator, and the error signal is used to control the magnetic field of the Faraday rotator.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: September 27, 1988
    Assignee: Eastman Kodak Company
    Inventors: Joseph F. Revelli, Douglas G. Stinson, Stuart D. Perry
  • Optical recording and information elements
    Patent number: 4578684
    Abstract: Optical recording elements having metal reflective layers which are coated on both sides with a ceramic overcoat are disclosed.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: March 25, 1986
    Assignee: Eastman Kodak Company
    Inventors: Mool C. Gupta, Douglas G. Stinson